Motor control arrangement



Jan. 23, 1951 R. G. WAMPACH MOTOR CONTROL ARRANGEMENT 2 Sheets-Sheet 1Filed April 6, 1949 INVENTOR ROBERT G. WAMPACH BY 7/ ATTORNEY Jan. 23,1951 R. G. WAMPACH MOTOR CONTROL ARRANGEMENT 2 Sheets-Sheet 2 FiledApril 6, 1949 FIG.

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MOTOR CONTROL ARRANGEMENT Robert G. Wampach, Chicago, 111., assignor toTeletype Corporation, Chicago, Ill., a corporation of DelawareApplication April 6, 1949, Serial No. 85,881

2 Claims.

This invention relates to telegraph communication systems and moreparticularly to motor control arrangements for use in such systems.

A primary object of the invention is to provide a motor controlarrangement which is effective automatically in response to diiierentline conditions.

More specifically, the present invention is concerned with facilitiesfor starting or stopping a motor after predetermined line conditionshave been established. For example, if the signal line is normallymarking, the motor will be started upon receipt of a break signal, orthe establishment of a break condition in the line. Moreover, with themotor control according to the present invention the motor will bestopped pursuant to a steadily marking line for a predetermined time.Furthermore, according to the invention, the motor Will be stopped andthe local rectifier will be shut ofi pursuant to a steadily spacing linefor a predetermined time. If the motor has been stopped and therectifier has been shut off, the rectifier will have power applied to itwhen the line is re-established after a break; but the motor will not bestarted until the receipt of another break signal.

A more complete understanding of the in vention may be had from thefollowing de'scrip tion taken in conjunction with the accompanyingdrawings, wherein,

Fig. l is an electrical circuit diagram of the switching centerassociated with the communication system according to the presentinvention;

Fig. ,2 is an electrical circuit diagram of the outlying stationconnected to the switching center in Which station is embodied the motorcontrol arrangement according to the present invention; and

Fig. 3 is a view showing the relative arrangement of Figs. 1 and 2.

Having reference to Figs. 1 and 2, the signal line circuit extends fromcontact I I (now closed) of motor start switch l2 (Fig. 2), overconductor I3, through the winding of relay I4, over conductor I5 tojunction 151, through contact I55, over conductor I58 to junction I59,over conductor l8, through the winding of line relay l9, through thestop contact 2! or" the set of transmitting contacts 22, over conductor23, through the battery 24 (Fig. 1), through patch board 25, overconductor 26, through stop contact 21 of the set of transmittingcontacts 28, over conductor 29, through contact 3! (normally closed) ,ofthe start key 32, over conductor 33, through patch board 25, overconductor 34,

through manually operated switch 35, through the winding of relay 36,over conductor 31, through the Winding of line relay 38, over conductor39, through patch board 25, over conductor 4| to contact II. In thiscondition of the circuit, which is a marking condition, the relays l4,I9, 36 and 38 are energized, and contacts 42, 5.3, 2'4 and 45 of relaysl4, I9, 36 and 38, respectively, are held closed. Relay [6 at this timeis short circuited.

The dotted rectangle 46 (Fig. 2) represents a telegraph printer orreceiver of the type exemplified by U. S. Patent No. 1,904,164. Thedotted rectangle 47 (Fig. 1) represents a typing reperforator machine ofthe type shown in U. S. Patent No. 2,348,214. The rectangle "53 (Fig. 1)represents a tape transmitter of the type shown in U. S. Patent No.2,296,845. Contacts 43 of line relay H3 in response to signalingimpulses controls the selector magnets is. Similarly, the' contacts 45of line relay 38 control the selector magnets 5| of the unit 47.Contacts 42' remain closed duringcode' impulsing, since relay 36 is slowacting.

It is assumed that motor 52 of unit 46, and motor 53 of unit 41 are notrunning. To initiate motors 52 and 53into operation, the key 54 of motorstart switch I2 is depressed, opening contacts H and 55 and closingcontact 56. The opening or" the line circuit at M will cause relay It tode-energize, thereby opening contact 42. and closing contact 5?. Uponthe closing of contact 57, a circuit is completed for relay 58 extendingfrom negative battery, through contact 51,, over conductor 59 tojunction til, then through contact 62 (now closed) of make-before breakcontact, over conductor 53 to junction 64, through contact 65 (nowclosed) or relay 6t, over conductor 6? to junction 68, through thewinding of relay 58 to junction 69, then through resistance l! andswitch 72 to positive battery. The energization of relay 58, however, isdeferred by the condenser or capacitor 13 which is connected in aparallel circuit extending from junction G8, over conductor it, throughcontact ?5 (now closed) of relay 58, over conductor '58, through contact52 (now closed), over conductor ll, through capacitor 73, over conductoris to junction 69, then through resistance 'nl and switch 72 to positivebattery. Because of the shunting effect of capacitor 73, relay 53 cannotoperate immediately. Capacitor i3 gradually becomes charged throughresistor 1! until the current through the relay 58 is sufficient tooperate this relay, starting the motors 52 and 53 as will presentlyappear. This short time delay, due to the charging of capacitor I3 isnecessary and suffi-- cient to insure that the receiving station motor53 has started before the calling station motor. As soon as the operatorhas become aware that the motors have started upon the lighting of lamp95 he will release the key 54 thereby clos ing contact 55 and openingcontact 553. The resistor I9 discharges capacitor i3 when the key 5 isreleased.

Following this delay caused by the shunting effect of capacitor 73, therelay 58 will become energized and thereby close its contacts BI, 82 and83, and will open its contacts 62, 84 and I5. A locking circuit forrelay 58 is thus completed from negative battery, over conductor 85,through contact 82 (now closed), over conductor 63 to junction 64, thenthrough contact 65, over conductor 6? to junction 68, through winding ofrelay 58, through resistor II and switch '12 to positive battery.

The closing of contact SI functions to complete an energizing circuitfor the motor control relay 81 (Fig. 2) from positive battery, throughcontact 8| (now closed), over conductor 88 to junction 89, then overconductor 9|, through switch 92, to junction 93, then over conductor 93, through the winding of relay 8-! to negative battery. Relay 8! uponenergization closes its contact 95 to complete an obvious circuit forthe motor 52 for operating the unit 45. Moreover, as previously statedupon the closing of contact BI the lamp 96 will be illuminated toindicate that the motor 52 is operating. Also, when contact 8I isclosed, the condensers I I? and I I8 will start charging, as will appearhereinafter.

Upon depressing the start switch key 5%, the motor 53 at the switchingcenter (Fig. l) is initiated into operation as follows: The depressionof key 5 opens contact II which opens the signal line and causes thede-energization of all of the relays connected in the signal line. Relay36 thus becomes ole-energized and causes its contacts 44 to open,thereby breaking the energizing circuit for the slow to release relay9'! which extended from positive battery through contact 98 of relay 9?,over conductor 99, through contact A i (when closed), over conductorII]! to junction Hi2, then through the winding of relay 9'! to negativebattery. Thus the tie-energization of relay 9? by opening contact 44causes the contact 93 to open and the contact I83 to close.

The closing of contact I63 establishes a circuit for energizing themotor control relay I04 in unit 41 extending from positive battery,through contact Hi3 (now closed), through contact Hi5, (now closed) oftape feed-out switch I86, over conductor Ifil, through switch I68 tojunction I09, then over conductor III and through the winding of relayIM to negative battery. Relay IE4, upon energizing, closes its contactM2 to establish an obvious operating cir uit for the motor 53 of unit41. Also, upon the closing of contact I63 the lamp H3 will beilluminated to indicate that the motor 53 is running. The closing ofcontact 64 in response to marking current on the line, will not causerelay 9'! to be operated because its contact 98 has been opened. Relay9?" can only be energized by closing switch H5, or contact I5 associatedwith key 32.

The delay introduced by capacitor is assures sufiicient time to releasethe relays connected in the aforedescribed line circuit. Now, with theunits 46 and 41 conditioned for operation, the transmission of messagesthrough the transmitting contacts 22 of the unit 46 under the control ofa keyboard device (not shown) will take place, and these messages willbe received by the unit 41f under the control of the selector magnets5|.

From the foregoing description it is observed that if the signal line isnormall marking, the motors 52 and 53 will start to operate upon receiptof a break signal. This break in the signal line may occur at contact II due to the depression of key 5 5, or it may occur at contact 3! due tothe depression of key I I4 of start key 32.

According to one feature of the invention, the motor 52 will shut offautomatically in response to either a steady marking or a spacingcondition (respectively) of the signal line for a predetermined time.During message transmission, the armatures associated with relays it,Hi, and 38 vibrate in response to the signal impulses (relay 25 beingslow acting, its armature it will not so vibrate). So long as relay 58remains energized, its contact BI remains closed and charging circuitsfor capacitors Hi and iii! are completed. The charging circuit forcapacitor Ii; extends from positive battery, through con tact 8I (nowclosed), over conductor 83 to junction 89, from thence the circuit forcapacitor II'I extends through adjustable resistance Hi) to junction I2I, then over conductor I 28 to junction I23, then through capacitorIITI, and resistance i2 5 to junction I25, over conductor 26 to junctionI21, then to negative battery. The capacitor I I1 tends to build up acharge, but since contact 51 of relay M is continually opening andclosing due to signal impulses being impressed on the signal line, theclosing of contact 51 during spacing intervals permits the capacitor II!to discharge over conductors I28 and I28, through contact 83 (nowclosed), over conductors B6 and 59, through contact 5? (when closed) tonegative battery.

Similarly, a charging circuit for capacitor II8 extends from positivebattery, through contact at (now closed), over conductor 88 to junction89, then over conductor I3I, through adjustable resistance I32 tojunction I33, then through capacitor H3 and resistance 13 to junctionI35, then over conductor I38 to junction I21, then to negative battery.The capacitor H8 tends to build up a charge, but since contact @2 is continually opening and closing in response to signal 1 impulses, theclosing of contact 42 during marking impulses permits the capacitor Hi;to discharge over conductor I33 and through contact '22 (when closed) tonegative battery.

In response to a steady marking condition on the signal line the contact42 will remain closed,

, accumulated a suflicient charge it will fire the electronic tube I31.Tube I3"! is a cold cathode gas triode (for example, of the type OALGmanufactured by General Electric Company), and when activated or fired,it will establish a circuit from negative battery, through junctionI2'I, over conductor I38, through tube I31, over conductor I39 tojunction I4I, then through contact I42, over conductor I43 and throughthe winding of relay 86 to positive battery. It is advantageous to use acold cathode tube for the reason that it obviates the necessity forproviding circuit facilities for heating a filament in hot cathodeelectronic tubes. Furthermore the life of a cold cathode tube is longerin the application described, since there is no filament to burn out,therefore, lends itself more readily to continuous standby operation forlong periods of time.

Relay 66 will become energized to close its contact I45 and open itscontact 65. I45 and I42 comprise a make-before-break contactarrangement, so that when contact I45 closes, the contact I42 will beopened to break the circuit through tube I31, thus extinguishing or.cutting-oil said tube I31. The opening of contact 65 of relay 66 willcause relay 58 to become de-energized. However, .relay 66 will remainenergized over a circuit extending from positive'battery, through thewinding of relay 66, through contact I45 (now closed), through theresistance I46, conductor 63, through contact 82 (still closed),conductor 85 to negative battery, until relay 58 tie-energizes, afterwhich time contact 82 opens and the sustaining circuit (just traced) forrelay 66 will be opened and relay 66 will be de-energized.

Upon de-energization of relay 58, its contact 8| opens, and the circuitfor motor control relay 81 is broken, thus causing relay 81 to becomede-energized to open its contact 95. The circuit for motor 52 is therebyopened at contact '95. The motor 52 may also be stopped manually byopening the manually operable switch 12, which functions to de-energizerelay 58 to open contact 8I.

According to the aforementioned feature of the invention, the motor 52will be stopped also in response to a steady or prolonged spacingcondition of the signal line. line is opened for any reason; and remainsopen, the relay I4 becomes de-energized and contact 42 thereof remainsopen. Thus, the shunt circuit for capacitor 8 is removed, and the capacitor H8 is permitted to build up a charge therein. When the capacitorH8 has accumulated a sufficient charge it will fire the electronic tubeI41. Tube I41 is also a cold cathode gas triode, and when activated orfired, it

will establish a circuit from negative battery to junction I21, overconductor I36 to junction I35, then through the tube I41, over conductorI48, through the winding of relay I49, over conductor II to junction I,then through contact I42, over conductor I43 and through the winding ofrelay 66 to positive battery. Relays 66 and I49- thereby becomeenergized. The energization of relay 66 functions, as hereinbeforedescribed in connection with sustained marking on the-signal line, tostop the motor 52 by de-energizing relay 58 and opening contact 8I.

Moreover, the energization of relay I49 functions to open the inputcircuit of a rectifier I52, and to remove the short circuit from thereset relay IS. The rectifier I52 is used to supply direct current tooperate the various relays at the station exemplifier by Fig. 2.Normally, the relay I49 of the mechanical latching relay unit I53 istie-energized, and its contacts I54 and I55 are closed. Contact I 54 isin the input circuit of the rectifier I52, thus controlling the supplyof alternating current thereto. The contact I55 is included in the shortcircuit across the reset coil I6.

When the relay I49 is thus energized due to a sustained spacingcondition of the signal line (or open line condition), contact I54 willbe opened to remove power from the rectifier, and contact I 55 will beopened to remove the shunt across relay I6. At substantially the sametime, the contacts I54 and I55 will be latched open by the ContactsThus, if the signal,

armature I56 of reset relay I6, and will remain open so long as thesignal line remains open (i. e.. as longas the spacing conditionpersists). Upon a resumption of marking condition on the line, therelays I4, I6, I9, 36 and 38 will again be energized over the previouslydescribed line circuit. Relay I6, upon energizing will pull upitsarmature I56 to release the contacts I54 and I The closing of con-' tactI54 will again establish the input circuit for, I55 will.

which will thereupon close.

rectifier I52. The closing of contact restore the shunt circuit forreset relay I6 extending from junction I51 on conductor I5, throughcontact I55 (now closed) of relay I49, over conductor I58 to junctionI59 between conductors I1 and I8. Relay I6 will remain deenergized untilthe latching relay I49 is again operated in response to a prolongedspacing condition on the line.

In the event that the motor 52 has been stopped in response to aprolonged marking condition on the signal line by the opening of contact8| of relay 58 and it is desired to operate the motor 52 for testpurposes, this maybe accomplished b operating switch 92 to batterysource I6I which will cause the motor control relay 81 to becomeenergized over the circuit extending from positive battery I6I, overswitch 92, conductor therefrom to junction 93, over conductor 94, andthrough the winding of relay 61 to negative battery. thereby closingcontact 95 to start the motor 52.

Switch I62 is shown in the automatic position; that is, with the switchI62 in the open position, as shown, the tube I31 will be operated inresponse to a prolonged marking condition to control the stopping ofmotor 52, as previously described. With the switch I 62 in the closedposition the motor 52 will not stop in response to a continued markingcondition, but only manually by opening switch 12. This condition may bedesired during continuousreasonably normal business.

Referring to Fig. 1, motors 53 (and 52, Fig. 2)

=' may also be started under control of the switchwill flow through thegas filled thermal switch I64 'to light a lamp I65 to indicate to theoperator cording of outgoing messages.

that the motors 52 and 53 are running. In the meantime, the opening ofthe line at contacts 3| has caused the relay I4 to release causing relay58 to operate and close its contact 8i to start the motor 52, aspreviously described. Also,

a circuit is completed torelay 91 through contact II6 (now closed) ofkey 32, holding relay 91 operated when contacts 44 of relay 36 open dueto the open line condition, thus preventing motor '53 from starting.This prevents the re- The motor 53 can only be stopped manually byclosing switch I I5 to re-energize relay 91, thereby opening contact I83in the circuit of the motor control relay IIl4. The motor 53 can bestarted manually for test purposes by operating switch I98 to engagebattery terminal I66.

The tape-out switch I06 is employed in the event it is desired to spaceout tape from unit 41. Upon depression of key I61, contacts I68,

76 I69 and "I will be closed, and contact I05 will be opened. Iheclosing of contact I68 completes a circuit for the tape feedout magnetITZ extending from positive battery, through contact I68, overconductorH3, and through the winding of magnet I12 to negative battery. Theclosing of contact I69 serves to place a shunt around the contact 45 tomake the selector magnets 5! nonresponsive to signal impulses over theline. The

closingof contact l'Il serves to supply power for operating themotorcontrol relay IM to keep the motor 53 running. A means forindicating a tape-out condition is also provided in unit 4?, andcomprises a contact I'M which closes when the tape supply has depleted,causing a lamp I15 to be lighted.

Assuming now that communication is takingp-lace between unit 46 (Fig. 1)and unit 41 (Fig. 1), and that unit cl is receiving. lit may happen thatthe operator at the switching station (Fig. 1) will :attempt to transmitfrom unit 4!! while said communication is taking place, As scribed inthe aforementioned Patent No. 2,296,845, the insertion of message tapein the unit 48 will result in the closing of contact I16, thuscompleting a circuit for start magnet ill from positive battery, throughthe winding of magnet I'll, ever conductor H3, through contact I19 ofrelay IBI, over conductor I82 to junction I83, then through contacts I16and I84 to negative battery. However, a circuit is also completed forthe energization of break relay IBI extending from negative battery,through contacts I84 and I16 to junction I33, then through a rectifierunit or varistor I85, over conductor I86, through the winding of relayI8I, over conductor IIl'I, through contact I88, over conductor I89,through contact Isl, over conductor I92 to junction I93, then throughpatchboard 25, and through contact Hi3 (still closed) to positivebattery. Relay ISI, upon energizing, will close its contacts I94, I 95,and i955, and open its contacts I79, ISI and IS'I. The busy lamp I98,which was lit, is now extinguished due to the opening of contact I91.The break lamp I99 will be lighted, indicating to the operator that hehas interrupted communication between units 46 and ll. Contact I96, uponclosing, will complete a circuit to a further alarm device, if desired.Contact I19, upon opening, will break the energizing circuit for thestart magnet I' l of the tape transmitter unit 48. Contact I94, whenclosed, completes a locking circuit for relay I8I.

Although the present invention has b en disclosed in connection withcertain specific embodiments thereof, it is understood that suchembodiments are merely illustrative and not restrictive, and that all"forms coming within the scope and equivalency of the appended claimsare intended to be covered by the invention.

What is claimed is:

1. In a telegraph system, a signal line. a telegraph receiver includingan operating motor, a motor control rela a pair of electron c tubes, a"first relay means responsive to marking and spacing impulses on saidline, a second relay means controlled by said first relay means, saidmotor control relay means onerab'y' related to" said-second relay means,individual capacitor means for each tube, c arging circuits for saidcapacitor means controlled by said second relay means, saidfirst relaymeans acting during normal reception of marking and spacing i nipulsesto discharge said capacitor means to render said tubes normallynon-conductive, one of said capacitor means effective under the con troloi said first relay means in response .to a prolonged marking conditionon said line to ace cumulate a suflicient charge under the control ofsaid second relay means to render one tube of said pair of tubesconductive, the other of said capacitor means efiective under thecontrol of said first relay means in response to a pro.- longed spacingcondition on said line to .accumulate a sufficient charge under thecontrol of said second relay means to render the other tube of said pairof tubes conductive, a rectifier for supplying current to all said relaymeans, a

rectifier control means operably related to one of said tubes, andadditional relay means for controlling said second relay means, saidtubes ,operably related, through said additional relay first relay meansresponsive to marl zing and.

spacing impulses on said line, a second relay means controlled by saidfirst relay means, said motor control relay means operably related tosaid second relay means, a capacitor means @SSQ?" ciated with said tube,a charging circuit for said Capacitor means controlled by said secondreay means, said first relay means acting dur.- ing normal reception ofalternate signal impulse conditions to discharge said capacitor means torender said tube normally non-.conduc tive, said capacitor meanseffective under the control of said first relay means in response to,

a prolonged signal condition on said line to accumulate a sufiicientcharge under the control of said second relay means to render said tubeconductive, a rectifier for supplying current to all said relay means, arectifier control means opera'oy related to said. tube, and additionalrelay means for controlling said second relay means, said tube operablyrelated, through said additional relay means and said second relaymeans, to said motor control relay means,

whereby said tube, when rendered conductive, is effective to controlsaid motor control relay means to stop said motor and to simultaneouslyoperate said rectifier control means to render saidv rectifiernon-operative.

ROBERT G. WAMPACH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,049,615 Levy et a1. Aug. 4,1-936 2,094,733 Byrnes Oct. 5, 1937 2,268,222 Peterson Dec. 30, 19M

Mullerheim June 1, 1948

